51555015320 has 64 divisors (see below), whose sum is σ = 122966618400. Its totient is φ = 19386132480.

The previous prime is 51555015319. The next prime is 51555015401. The reversal of 51555015320 is 2351055515.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 539990 + ... + 628250.

Almost surely, 2^51555015320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51555015320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61483309200).

51555015320 is an abundant number, since it is smaller than the sum of its proper divisors (71411603080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51555015320 is a wasteful number, since it uses less digits than its factorization.

51555015320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89148 (or 89144 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 32.

The spelling of 51555015320 in words is "fifty-one billion, five hundred fifty-five million, fifteen thousand, three hundred twenty".